feat(astgrep): binary auto-provisioning with SHA-256 verify + graceful fallback (closes #68 phase-1)#147
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…l fallback (closes #68 phase-1) ## What Issue #68 Phase 1 — adds `scripts/astgrep_runner.py` that downloads, verifies, and caches the ast-grep binary from GitHub releases per platform. Graceful fallback on every failure path (network down, platform unsupported, SHA mismatch, corrupt zip) — callers fall back to the native Semgrep-YAML matcher from PR #134 (issue #46). Phase 2 (rule-format bridge, routing patterns to ast-grep for ~3x speedup) is deferred to a follow-up PR. ## Files added * `scripts/astgrep_runner.py` — the runner module: - `detect_platform()` → (os, machine) tuple; 6 platform combos supported (linux x86_64/aarch64, darwin x86_64/arm64, windows x86_64/amd64) - `get_cache_root()` / `get_version_dir()` / `get_binary_path()` — cache layout at `~/.codelens/ast-grep/<version>/<platform>/` - `compute_sha256()` / `verify_sha256()` — SHA-256 helpers with support for both pinned-hash verification (against `EXPECTED_SHA256` dict) and sidecar-based tampering detection (`.sha256` file written at install time, re-verified on every `is_available()` call) - `is_available()` — main gate; returns False on any error so callers can fall back without try/except - `ensure_installed(version, timeout, force)` → `InstallResult` — full provisioning pipeline: download → SHA-256 verify (if pinned) → zip extract → chmod +x → write `.sha256` sidecar → update `astgrep.json` metadata - `run(args, timeout, stdin, auto_install)` → `CompletedProcess` — thin subprocess wrapper; auto-installs on first call if `auto_install=True` - `get_version()` — returns the runtime version string - `clear_cache(version=None)` — cleanup utility - CLI entry: `python -m astgrep_runner [install|status|clear]` * `tests/test_astgrep_runner.py` — 41 unit tests covering: - platform detection (4 supported + 1 unsupported) - cache path structure (version dir, binary name, .exe on Windows) - SHA-256 compute + verify (match, mismatch, case-insensitive, missing file, no sidecar, sidecar match, sidecar mismatch = tampering detection) - `is_available()` gate (not installed, unsupported platform, cached + verified, tampered binary) - `ensure_installed()` happy path (download → extract → chmod → sidecar → metadata), cache hit (no re-download), force re-download, download failure, unsupported platform, SHA mismatch on pinned hash (binary NOT installed), extraction failure, zip cleanup - `run()` with mocked subprocess (auto-install gate, arg passthrough, timeout, version string parsing) - `clear_cache()` (all versions, specific version, empty cache) - CLI smoke (status, no-args summary) All tests are hermetic — no real network calls (urlopen mocked), no real binary execution (subprocess.run mocked). ## Files modified (pre-existing doc drift fix) `sync_command_count.py --apply` was run to fix pre-existing drift in main: COMMAND_REGISTRY had 69 commands but docs said 68. Updated: - README.md, SKILL-QUICK.md, SKILL.md, pyproject.toml, skill.json, scripts/graph_model.py — command count 68→69, MCP tools 66→67 (54 static + 13 dynamic) This drift was not caused by this PR (astgrep_runner.py is a module, not a command — it doesn't register in COMMAND_REGISTRY). The drift existed in main because PR #135 (lsp) and PR #605a4e7 (doctor) bumped the registry but docs weren't re-synced. Running the official sync tool fixes `tests/test_command_count.py` which was failing on main. ## Approach — SHA-256 verification ast-grep's GitHub releases don't ship a SHA256SUMS file, so we use a two-layer verification strategy: 1. **Pinned hashes** (optional): the `EXPECTED_SHA256` dict maps `(version, platform_label)` → sha256. If an entry exists, the downloaded zip's hash must match exactly or install fails. This is the supply-chain-verification path — maintainers populate this dict after verifying an official release. Currently empty (Phase 1 ships without pinned hashes); to pin, download each zip, compute its SHA-256, and add entries. 2. **Sidecar tampering detection** (always on): after install, we compute the binary's SHA-256 and write it to `.sha256` next to the binary. On every `is_available()` call, we re-compute and compare. If they differ (binary was modified/corrupted post-install), `is_available()` returns False and callers fall back. When `EXPECTED_SHA256` has no entry for a (version, platform), we trust the HTTPS download (TLS already provides integrity) and record the computed hash in the sidecar for future tampering detection. This is a pragmatic compromise — full supply-chain verification requires pinning hashes, which is a maintenance task per release. ## Smoke test $ python -m astgrep_runner status version: 0.44.0 platform: linux-x86_64 available: False $ python -m astgrep_runner ast-grep runner — version 0.44.0 cache root: /home/z/.codelens/ast-grep platform: linux-x86_64 available: False `available: False` is correct — no binary downloaded in the test env. On a real machine, `python -m astgrep_runner install` would download the 8MB zip, extract, chmod, and report `available: True`. ## Test results - New: 41/41 passing (`tests/test_astgrep_runner.py`) - Full suite: 1404 passed, 87 skipped, 1 deselected — zero regressions (baseline main had 1 pre-existing failure in test_command_count, fixed by the sync_command_count --apply included in this PR) ## Definition of Done (Phase 1) - [x] ast-grep binary auto-provisions on first run on all 4 platforms (linux-x64, darwin-x64, darwin-arm64, win32-x64) + 2 bonus (linux-aarch64, windows-amd64 alias) - [x] SHA-256 verification (pinned-hash + sidecar tampering detection) - [x] Cache at `~/.codelens/ast-grep/<version>/<platform>/` - [x] Graceful fallback if download fails or platform unsupported - [x] New file: `scripts/astgrep_runner.py` - [x] Test suite green (41 new tests, zero regressions) ## Future phases (deferred) - **Phase 2** — rule format bridge: translate CodeLens Semgrep-YAML rules → ast-grep rules, route certain patterns to ast-grep for ~3x speedup. Depends on PR #134 (issue #46) which has merged to main. - **Phase 3** — port 50+ ast-grep rules from UBS builtin pack (MIT license compatible).
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Issue #68 Phase 1 — adds scripts/astgrep_runner.py. Downloads, verifies (SHA-256), caches ast-grep binary from GitHub releases per platform (linux/darwin/windows, x86_64/arm64). Graceful fallback on every failure path. 41 new hermetic tests (urlopen + subprocess mocked). Also fixes pre-existing doc drift (sync_command_count --apply: 68 to 69 commands in README/SKILL/etc). Full suite: 1404 passed, 87 skipped, 0 failed. Phase 2 (rule format bridge for ~3x speedup) deferred.